Abstract
High-power applications at fast charge and discharge rates are still great challenges in the development of rechargeable lithium batteries. Here, we demonstrate that ultralong LiV3O8 nanowire cathode materials synthesized by topotactic Li intercalation present excellent high-rate and long-life performance. At the current density of 2000, mA g−1, the initial and the six-hundredth discharge capacities can reach 137 and 120 mAh g−1, respectively, corresponding to a capacity fading of only 0.022% per cycle. Such performance indicates that the topotactically synthesized ultralong LiV3O8 nanowires are promising cathode materials for high-rate and long-life rechargeable lithium batteries.
Highlights
With the rapid development of mobile devices and electric vehicles, rechargeable Li batteries are widely considered to be some of the most promising rechargeable batteries.[1,2,3] the low-power density caused by the low Li ion, and electron transport speed has limited their practical high-power applications
H2V3O8 nanowires were reported to have a ultralong one-dimensional morphology and a layered crystal structure similar to LiV3O8,38 which allow the topotactic Li intercalation to form LiV3O8. This means that the resulting LiV3O8 will generally maintain the ultralong morphology and have a large surface area and a short Li ion transport pathway, which are crucial for producing an acceptable high-rate performance
In the present work, based on the topotactic intercalation mechanism, we proposed a facile and mass-produced route to synthesize ultralong LiV3O8 nanowires with excellent high-rate and long-life performance to serve as the cathode material in rechargeable Li batteries
Summary
With the rapid development of mobile devices and electric vehicles, rechargeable Li batteries are widely considered to be some of the most promising rechargeable batteries.[1,2,3] the low-power density caused by the low Li ion, and electron transport speed has limited their practical high-power applications. It has been reported that its electrochemical performance is greatly influenced by the morphology and synthesis method.[16,17,18,19] During the past 30 years, many methods have been proposed to improve the electrochemical properties of LiV3O8 with different morphologies.[20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36] LiV3O8 nanowires with large aspect ratios and surface areas, which are supposed to have a desirable high-rate performance when used as the cathode material in rechargeable Li batteries, have rarely been reported.[22] H2V3O8 (reported as V3O7 Á H2O; from a structural point of view, the formulation H2V3O8 is more appropriate than that of V3O7 Á H2O 37) nanowires were reported to have a ultralong one-dimensional morphology and a layered crystal structure similar to LiV3O8,38 which allow the topotactic Li intercalation to form LiV3O8 This means that the resulting LiV3O8 will generally maintain the ultralong morphology and have a large surface area and a short Li ion transport pathway, which are crucial for producing an acceptable high-rate performance. In the present work, based on the topotactic intercalation mechanism, we proposed a facile and mass-produced route to synthesize ultralong LiV3O8 nanowires with excellent high-rate and long-life performance to serve as the cathode material in rechargeable Li batteries
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